/****************************************************************************
 *
 * Copyright 2016 Samsung Electronics All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
 * either express or implied. See the License for the specific
 * language governing permissions and limitations under the License.
 *
 ****************************************************************************/
/****************************************************************************
 * fs/aio/aio_signal.c
 *
 *   Copyright (C) 2014 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ****************************************************************************/

/****************************************************************************
 * Included Files
 ****************************************************************************/

#include <tinyara/config.h>

#include <sys/types.h>
#include <sched.h>
#include <signal.h>
#include <aio.h>
#include <assert.h>
#include <errno.h>
#include <debug.h>

#include "aio/aio.h"

#ifdef CONFIG_FS_AIO

/****************************************************************************
 * Pre-processor Definitions
 ****************************************************************************/

/****************************************************************************
 * Private Types
 ****************************************************************************/

/****************************************************************************
 * Private Data
 ****************************************************************************/

/****************************************************************************
 * Public Data
 ****************************************************************************/

/****************************************************************************
 * Private Functions
 ****************************************************************************/

/****************************************************************************
 * Public Functions
 ****************************************************************************/
/****************************************************************************
 * Name: aio_signal
 *
 * Description:
 *   Signal the client that an I/O has completed.
 *
 * Input Parameters:
 *   pid    - ID of the task to signal
 *   aiocbp - Pointer to the asynchronous I/O state structure that includes
 *            information about how to signal the client
 *
 * Returned Value:
 *   Zero (OK) if the client was successfully signalled.  Otherwise, a
 *   negated errno value is returned.
 *
 * Assumptions:
 *   This function runs only in the context of the worker thread.
 *
 ****************************************************************************/

int aio_signal(pid_t pid, FAR struct aiocb *aiocbp)
{
#ifdef CONFIG_CAN_PASS_STRUCTS
	union sigval value;
#endif
	int errcode;
	int status;
	int ret;

	DEBUGASSERT(aiocbp);

	ret = OK;					/* Assume success */

	/* Signal the client */

	if (aiocbp->aio_sigevent.sigev_notify == SIGEV_SIGNAL) {
#ifdef CONFIG_CAN_PASS_STRUCTS
		status = sigqueue(pid, aiocbp->aio_sigevent.sigev_signo, aiocbp->aio_sigevent.sigev_value);
#else
		status = sigqueue(pid, aiocbp->aio_sigevent.sigev_sign, aiocbp->aio_sigevent.sigev_value.sival_ptr);
#endif
		if (status < 0) {
			errcode = get_errno();
			fdbg("ERROR: sigqueue #1 failed: %d\n", errcode);
			ret = ERROR;
		}
	}

	/* Send the poll signal in any event in case the caller is waiting
	 * on sig_suspend();
	 */

#ifdef CONFIG_CAN_PASS_STRUCTS
	value.sival_ptr = aiocbp;
	status = sigqueue(pid, SIGPOLL, value);
#else
	status = sigqueue(pid, SIGPOLL, aiocbp);
#endif
	if (status && ret == OK) {
		errcode = get_errno();
		fdbg("ERROR: sigqueue #2 failed: %d\n", errcode);
		ret = ERROR;
	}

	/* Make sure that errno is set correctly on return */

	if (ret < 0) {
		set_errno(errcode);
		return ERROR;
	}

	return OK;
}

#endif							/* CONFIG_FS_AIO */
